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CVE-2022-49778

5.5 · MEDIUM

In the Linux kernel, the following vulnerability has been resolved: arm64/mm: fix incorrect file_map_count for non-leaf pmd/pud The page table check trigger BUG_ON() unexpectedly when collapse hu…

Published May 1, 2025CWE-617EPSS 0.17%

Overview

CVE-2022-49778 is a medium-severity vulnerability. It was published on May 1, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

arm64/mm: fix incorrect file_map_count for non-leaf pmd/pud

The page table check trigger BUG_ON() unexpectedly when collapse hugepage:

------------[ cut here ]------------

kernel BUG at mm/page_table_check.c:82!

Internal error: Oops - BUG: 00000000f2000800 [#1] SMP

Dumping ftrace buffer:

(ftrace buffer empty)

Modules linked in:

CPU: 6 PID: 68 Comm: khugepaged Not tainted 6.1.0-rc3+ #750

Hardware name: linux,dummy-virt (DT)

pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--)

pc : page_table_check_clear.isra.0+0x258/0x3f0

lr : page_table_check_clear.isra.0+0x240/0x3f0

[...]

Call trace:

page_table_check_clear.isra.0+0x258/0x3f0

__page_table_check_pmd_clear+0xbc/0x108

pmdp_collapse_flush+0xb0/0x160

collapse_huge_page+0xa08/0x1080

hpage_collapse_scan_pmd+0xf30/0x1590

khugepaged_scan_mm_slot.constprop.0+0x52c/0xac8

khugepaged+0x338/0x518

kthread+0x278/0x2f8

ret_from_fork+0x10/0

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/2d458046df634088611d44fd77f45465e833ef78Refgit.kernel.org/stable/c/5b47348fc0b18a78c96f8474cc90b7525ad1bbfe

How CyberStrike helps

Frequently asked questions

What is CVE-2022-49778?

CVE-2022-49778 is a medium-severity vulnerability. It was published on May 1, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-49778?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-49778?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-49778?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-49778 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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